lethal

noun

Any weapon that causes death.

(genetics) An allele that causes the death of the organism that carries it.

(chemistry) One of the higher alcohols of the paraffine series obtained from spermaceti as a white crystalline solid.

adjective

Of, pertaining to, or causing death; deadly; mortal; fatal.

Roots

letumleth- · Latin · death

Synonyms for lethal

deadlyadv fataladj deathlyadv mortaladj poisonousadj venomousadj virulentadj toxicadj viciousadj pestilentadj

Synonyms & related words for lethal

Find synonyms, related words, and the definition of lethal — including deadly, fatal, deathly, mortal, poisonous, venomous. Dendril is a free visual thesaurus that shows them on an interactive map where stronger matches sit closer to the center — no signup, no ads.

Words related to lethal

Explore words related to lethal — words associated with it, words that go with it, and its nearest matches in meaning. Related words include sublethal, lethality, nonlethal, sublethally, lethally, deadliness, nonfatal, venomousness. Click any word to make it the center of the map and keep exploring the web of connections.

Synonyms for lethal

Common synonyms for lethal include deadly, fatal, deathly, mortal, poisonous, venomous, virulent, toxic — words that share a close meaning. Hover or tap any word on the map for its definition and part of speech.

Where does lethal come from?

The word lethal breaks down into one root of Latin origin: the root leth-, from Latin letum (“death”). Explore each root to see other English words built from the same source.